Monday, May 3, 2021

[Botany • 2019] Dahlia mixtecana (Asteraceae, Coreopsideae) • A Striking New Species from Oaxaca, Mexico

Dahlia mixtecana Reyes, Islas & Art. Castro.

in Reyes-Santiago, Islas-Luna, Munguía-Lino & Castro-Castro, 2019.

Dahlia mixtecana (Asteraceae, Coreopsideae) is described and illustrated as a new species endemic to western Oaxaca, Mexico. This taxon is related to Dahlia sect. Dahlia and Dahlia sect. Entemophyllon. However, based on the current evidence available and the current system of infrageneric groups, it does not appear possible to assign the new species with confidence to any taxonomic section. The description of the new species is presented with distribution maps, illustrations, photographs, discussions on the taxonomic relationship and an identification key to the sections and species of Dahlia occurring in Oaxaca and species in Dahlia sect. Entemophyllon related to D. mixtecana.

Keywords: Compositae, Mixteca Alta, Tlaxiaco, Eudicots

FIGURE 3. Dahlia mixtecana Reyes, Islas & Art. Castro.
A. Habit. B. Detail of tuberous rootstock. C. Detail of the leaf. D. Front and lateral view of a head and involucre. E. Stem section with a node. F. Ray florets. G. Palea. H. Disk florets. I. Gynoecium and androecium details. J. Variations in cypselae. Illustrated by Omar González Zorzano, based on type material.

Dahlia mixtecana Reyes, Islas & Art. Castro sp. nov.

Etymology:—The specific epithet refers to the Mixteca culture from Oaxaca, Mexico.

Jerónimo Reyes-Santiago, María de los Ángeles Islas-Luna, Guadalupe Munguía-Lino and Arturo Castro-Castro. 2019. Dahlia mixtecana (Asteraceae, Coreopsideae), A Striking New Species from Oaxaca, Mexico. Phytotaxa. 394(3); 209–218. DOI: 10.11646/phytotaxa.394.3.2